diff options
Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
| -rw-r--r-- | arch/x86/include/asm/pgtable.h | 150 |
1 files changed, 112 insertions, 38 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index e39311a89bf4..4c2d080d26b4 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -120,6 +120,34 @@ extern pmdval_t early_pmd_flags; #define arch_end_context_switch(prev) do {} while(0) #endif /* CONFIG_PARAVIRT_XXL */ +static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set) +{ + pmdval_t v = native_pmd_val(pmd); + + return native_make_pmd(v | set); +} + +static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) +{ + pmdval_t v = native_pmd_val(pmd); + + return native_make_pmd(v & ~clear); +} + +static inline pud_t pud_set_flags(pud_t pud, pudval_t set) +{ + pudval_t v = native_pud_val(pud); + + return native_make_pud(v | set); +} + +static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear) +{ + pudval_t v = native_pud_val(pud); + + return native_make_pud(v & ~clear); +} + /* * The following only work if pte_present() is true. * Undefined behaviour if not.. @@ -174,6 +202,13 @@ static inline int pud_young(pud_t pud) return pud_flags(pud) & _PAGE_ACCESSED; } +static inline bool pud_shstk(pud_t pud) +{ + return cpu_feature_enabled(X86_FEATURE_SHSTK) && + (pud_flags(pud) & (_PAGE_RW | _PAGE_DIRTY | _PAGE_PSE)) == + (_PAGE_DIRTY | _PAGE_PSE); +} + static inline int pte_write(pte_t pte) { /* @@ -310,6 +345,30 @@ static inline int pud_devmap(pud_t pud) } #endif +#ifdef CONFIG_ARCH_SUPPORTS_PMD_PFNMAP +static inline bool pmd_special(pmd_t pmd) +{ + return pmd_flags(pmd) & _PAGE_SPECIAL; +} + +static inline pmd_t pmd_mkspecial(pmd_t pmd) +{ + return pmd_set_flags(pmd, _PAGE_SPECIAL); +} +#endif /* CONFIG_ARCH_SUPPORTS_PMD_PFNMAP */ + +#ifdef CONFIG_ARCH_SUPPORTS_PUD_PFNMAP +static inline bool pud_special(pud_t pud) +{ + return pud_flags(pud) & _PAGE_SPECIAL; +} + +static inline pud_t pud_mkspecial(pud_t pud) +{ + return pud_set_flags(pud, _PAGE_SPECIAL); +} +#endif /* CONFIG_ARCH_SUPPORTS_PUD_PFNMAP */ + static inline int pgd_devmap(pgd_t pgd) { return 0; @@ -480,20 +539,6 @@ static inline pte_t pte_mkdevmap(pte_t pte) return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP); } -static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set) -{ - pmdval_t v = native_pmd_val(pmd); - - return native_make_pmd(v | set); -} - -static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) -{ - pmdval_t v = native_pmd_val(pmd); - - return native_make_pmd(v & ~clear); -} - /* See comments above mksaveddirty_shift() */ static inline pmd_t pmd_mksaveddirty(pmd_t pmd) { @@ -588,20 +633,6 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd) pmd_t pmd_mkwrite(pmd_t pmd, struct vm_area_struct *vma); #define pmd_mkwrite pmd_mkwrite -static inline pud_t pud_set_flags(pud_t pud, pudval_t set) -{ - pudval_t v = native_pud_val(pud); - - return native_make_pud(v | set); -} - -static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear) -{ - pudval_t v = native_pud_val(pud); - - return native_make_pud(v & ~clear); -} - /* See comments above mksaveddirty_shift() */ static inline pud_t pud_mksaveddirty(pud_t pud) { @@ -780,6 +811,12 @@ static inline pmd_t pmd_mkinvalid(pmd_t pmd) __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE))); } +static inline pud_t pud_mkinvalid(pud_t pud) +{ + return pfn_pud(pud_pfn(pud), + __pgprot(pud_flags(pud) & ~(_PAGE_PRESENT|_PAGE_PROTNONE))); +} + static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask); static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) @@ -827,14 +864,8 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) pmd_result = __pmd(val); /* - * To avoid creating Write=0,Dirty=1 PMDs, pte_modify() needs to avoid: - * 1. Marking Write=0 PMDs Dirty=1 - * 2. Marking Dirty=1 PMDs Write=0 - * - * The first case cannot happen because the _PAGE_CHG_MASK will filter - * out any Dirty bit passed in newprot. Handle the second case by - * going through the mksaveddirty exercise. Only do this if the old - * value was Write=1 to avoid doing this on Shadow Stack PTEs. + * Avoid creating shadow stack PMD by accident. See comment in + * pte_modify(). */ if (oldval & _PAGE_RW) pmd_result = pmd_mksaveddirty(pmd_result); @@ -844,6 +875,29 @@ static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot) return pmd_result; } +static inline pud_t pud_modify(pud_t pud, pgprot_t newprot) +{ + pudval_t val = pud_val(pud), oldval = val; + pud_t pud_result; + + val &= _HPAGE_CHG_MASK; + val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK; + val = flip_protnone_guard(oldval, val, PHYSICAL_PUD_PAGE_MASK); + + pud_result = __pud(val); + + /* + * Avoid creating shadow stack PUD by accident. See comment in + * pte_modify(). + */ + if (oldval & _PAGE_RW) + pud_result = pud_mksaveddirty(pud_result); + else + pud_result = pud_clear_saveddirty(pud_result); + + return pud_result; +} + /* * mprotect needs to preserve PAT and encryption bits when updating * vm_page_prot @@ -1078,8 +1132,7 @@ static inline pmd_t *pud_pgtable(pud_t pud) #define pud_leaf pud_leaf static inline bool pud_leaf(pud_t pud) { - return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) == - (_PAGE_PSE | _PAGE_PRESENT); + return pud_val(pud) & _PAGE_PSE; } static inline int pud_bad(pud_t pud) @@ -1383,10 +1436,28 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, } #endif +#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD +static inline pud_t pudp_establish(struct vm_area_struct *vma, + unsigned long address, pud_t *pudp, pud_t pud) +{ + page_table_check_pud_set(vma->vm_mm, pudp, pud); + if (IS_ENABLED(CONFIG_SMP)) { + return xchg(pudp, pud); + } else { + pud_t old = *pudp; + WRITE_ONCE(*pudp, pud); + return old; + } +} +#endif + #define __HAVE_ARCH_PMDP_INVALIDATE_AD extern pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp); +pud_t pudp_invalidate(struct vm_area_struct *vma, unsigned long address, + pud_t *pudp); + /* * Page table pages are page-aligned. The lower half of the top * level is used for userspace and the top half for the kernel. @@ -1668,6 +1739,9 @@ void arch_check_zapped_pte(struct vm_area_struct *vma, pte_t pte); #define arch_check_zapped_pmd arch_check_zapped_pmd void arch_check_zapped_pmd(struct vm_area_struct *vma, pmd_t pmd); +#define arch_check_zapped_pud arch_check_zapped_pud +void arch_check_zapped_pud(struct vm_area_struct *vma, pud_t pud); + #ifdef CONFIG_XEN_PV #define arch_has_hw_nonleaf_pmd_young arch_has_hw_nonleaf_pmd_young static inline bool arch_has_hw_nonleaf_pmd_young(void) |